I am not sure, but the Edelbrock TES headers would probably work. They are shorties with a factory type Y pipe. I have them with an automatic and they have provisions for everything, so I think they will work. However, I have never seen the manual linkage in person so I am not sure. You can also look at the header catalogs for a 1978 or 79 model Malibu with a 305 and see what the manufacturers say fit. Most header companies will have listings for the options that will and will not work with their products